Sensors
If a firmware update is required when you add a new SensorPush device to your account, it will be automatically installed as part of the setup process. The install takes about a minute. You'll see the progress of the update and can continue the setup when it is finished.
After you're using a sensor, if a firmware update is released, an "UPDATE FIRMWARE" button will appear at the bottom of the sensor details screen (below the graphed data and the CSV export button).
Simply tap the button while within Bluetooth range of the sensor and the firmware will update. The process only takes about a minute, and you'll be shown progress until it completes. Don't close the app or increase your distance from the sensor until it's finished.
Gateways
SensorPush gateway firmware is updated automatically using the device's internet connection. No action is needed on your part.